Osaka September weather
Osaka, Japan · September
Still hot by day, but evenings slowly cool down
September in Osaka feels like a blend of summer and autumn. Days are still hot, but mornings and nights begin to carry a cooler breeze.
This period overlaps with typhoon season, so some days can be very windy and rainy. It is important to check the weather forecast frequently before and during your trip.
September averages at a glance
Average low
around 21°C
Average high
around 29°C
Average rainfall
around 155 mm
Rainy days
about 10 days
What to wear in September in Osaka
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Daytime still feels like August, so light T-shirts, thin shirts, and breathable bottoms are best.
- • Pack a thin cardigan or long-sleeve shirt for cooler mornings and nights.
- • In late September, more autumnal outfits—shirts with slacks, light knits—start to feel appropriate.
Travel tips for visiting Osaka in September
- • Because of potential typhoons, check weather apps frequently and keep indoor and outdoor plans flexible.
- • Humidity is still high, so stay hydrated and prioritize ventilation in your clothing.
- • Visitor numbers often dip compared with peak summer, so you may enjoy slightly more relaxed crowds.
September weather in Osaka — FAQ
Q. Do I still need to wear short sleeves in September?
A. Yes. Especially in early and mid-September, daytime temperatures are high enough that short sleeves are most comfortable. Just add one or two light long-sleeve layers for evenings and indoor AC.
Q. What happens to travel plans if a typhoon hits?
A. On days with direct typhoon impact, outdoor activities may be difficult, but intense conditions often last only a day or two. If you have indoor back-up plans—malls, cafés, museums—you can still enjoy the trip.
Q. Is it too early for “autumn vibe” photos?
A. Full autumn foliage has not started yet, but from late September onward, clear blue skies and slightly cooler air are perfect for “late-summer, early-autumn” style photos.
Authored by Jiheon Bang
Updated: 2025-12-01
Reviewed using Visual Crossing Weather data and reorganized from a traveler’s perspective.
Weather data is designed to be refreshed roughly every 10 minutes.